/Engine/Source/Runtime/Datasmith/CADKernel/Public/CADKernel/Geo/Surfaces/Surface.h
virtual void LinesNotDerivables ( const [FSurfacicBoundary](API\Runtime\CADKernel\CADKernel\Math\FSurfacicBoundary) & Bounds, int32 InDerivativeOrder, [FCoordinateGrid](API\Runtime\CADKernel\CADKernel\Geo\FCoordinateGrid) & OutNotDerivableCoordinates ) const